<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>17 Symbol内置属性</title>
</head>

<body>
    <script>
        // class Person {
        //     static [Symbol.hasInstance](param) {
        //         console.log(param);
        //         console.log('我被用来检测类型了');
        //     }
        // }

        // let o = {};
        // console.log(o instanceof Person);

        const arr = [1, 2, 3];
        const arr2 = [4, 5, 6];
        arr2[Symbol.isConcatSpreadable] = false;
        console.log(arr.concat(arr2));
    </script>
</body>

</html>